package com.resourcestore.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

import com.opensymphony.xwork2.ActionContext;

public class RandomAction extends BaseAction{  
	private ByteArrayInputStream inputStream;  
	public String execute() throws Exception{  
	//       在内存中创建图象  
	        int width=85, height=20;  
	        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
	//       获取图形上下文  
	        Graphics g = image.getGraphics();  
	//      生成随机类  
	        Random random = new Random();  
	//       设定背景色  
	        g.setColor(getRandColor(200,250));  
	        g.fillRect(0, 0, width, height);  
	//      设定字体  
	        g.setFont(new Font("Times New Roman",Font.PLAIN,18));  
	//       随机产生155条干扰线，使图象中的认证码不易被其它程序探测到  
	        g.setColor(getRandColor(160,200));  
	        for (int i=0;i<155;i++)  
	        {  
	         int x = random.nextInt(width);  
	         int y = random.nextInt(height);  
	                int xl = random.nextInt(12);  
	                int yl = random.nextInt(12);  
	         g.drawLine(x,y,x+xl,y+yl);  
	        }  
	//       取随机产生的认证码(6位数字)  
	        String sRand="";  
	        for (int i=0;i<6;i++){  
	            String rand=String.valueOf(random.nextInt(10));  
	            sRand+=rand;  
	            // 将认证码显示到图象中  
	            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));  
	//      调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成  
	            g.drawString(rand,13*i+6,16);  
	        }  
	//       将认证码存入SESSION  
	        ActionContext.getContext().getSession().put("rand",sRand);  
	//       图象生效  
	        g.dispose();  
	        ByteArrayOutputStream output = new ByteArrayOutputStream();  
	        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);  
	        ImageIO.write(image, "JPEG", imageOut);  
	        imageOut.close();  
	        ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());  
	        this.setInputStream(input);  
	        return SUCCESS;  
	    }  
	    /*  
	     * 给定范围获得随机颜色  
	     */  
	    private Color getRandColor(int fc,int bc){  
	        Random random = new Random();  
	        if(fc>255) fc=255;  
	        if(bc>255) bc=255;  
	        int r=fc+random.nextInt(bc-fc);  
	        int g=fc+random.nextInt(bc-fc);  
	        int b=fc+random.nextInt(bc-fc);  
	        return new Color(r,g,b);  
	   }  
	    public void setInputStream(ByteArrayInputStream inputStream) {  
	        this.inputStream = inputStream;  
	    }  
	    public ByteArrayInputStream getInputStream() {  
	        return inputStream;  
	    }  
	  
	}  
